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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*/
#include <misc/config.h>
#include "exhaustive.h"
#include "anomalous.h"
#include "ansi.h"
#include "gen/curve.h"
#include "gen/equation.h"
#include "gen/field.h"
#include "gen/gens.h"
#include "gen/order.h"
#include "gen/point.h"
#include "io/output.h"
#include "util/memory.h"
static void exhaustive_ginit(gen_t *generators, const config_t *cfg) {
if (cfg->ansi) {
// setup ANSI X9.62 generators
if (cfg->seed) {
generators[OFFSET_SEED] = &ansi_gen_seed_argument;
} else {
if (cfg->random) {
generators[OFFSET_SEED] = &ansi_gen_seed_random;
} else {
generators[OFFSET_SEED] = &ansi_gen_seed_input;
}
}
generators[OFFSET_A] = &gen_skip;
generators[OFFSET_B] = &ansi_gen_equation;
generators[OFFSET_CURVE] = &curve_gen_nonzero;
generators[OFFSET_ORDER] = &order_gen_any;
} else {
// setup normal generators
generators[OFFSET_SEED] = &gen_skip;
if (cfg->anomalous) {
generators[OFFSET_A] = &gen_skip;
generators[OFFSET_B] = &anomalous_gen_equation;
} else if (cfg->random) {
generators[OFFSET_A] = &a_gen_random;
generators[OFFSET_B] = &b_gen_random;
} else {
generators[OFFSET_A] = &a_gen_input;
generators[OFFSET_B] = &b_gen_input;
}
if (cfg->koblitz) {
switch (cfg->koblitz_value) {
case 0:
generators[OFFSET_A] = &a_gen_zero;
break;
case 1:
generators[OFFSET_A] = &a_gen_one;
break;
default:
break;
}
generators[OFFSET_B] = &b_gen_one;
}
generators[OFFSET_CURVE] = &curve_gen_nonzero;
if (cfg->prime) {
generators[OFFSET_ORDER] = &order_gen_prime;
} else if (cfg->cofactor) {
generators[OFFSET_ORDER] = &order_gen_smallfact;
} else if (cfg->anomalous) {
generators[OFFSET_ORDER] = &anomalous_gen_order;
} else {
generators[OFFSET_ORDER] = &order_gen_any;
}
}
// setup common generators
if (cfg->unique) {
generators[OFFSET_GENERATORS] = &gens_gen_one;
} else {
generators[OFFSET_GENERATORS] = &gens_gen_any;
}
if (cfg->anomalous) {
generators[OFFSET_FIELD] = &anomalous_gen_field;
} else if (cfg->random) {
generators[OFFSET_FIELD] = &field_gen_random;
} else {
generators[OFFSET_FIELD] = &field_gen_input;
}
switch (cfg->points.type) {
case POINTS_RANDOM:
if (cfg->points.amount) {
generators[OFFSET_POINTS] = &points_gen_random;
} else {
generators[OFFSET_POINTS] = &point_gen_random;
}
break;
case POINTS_PRIME:
generators[OFFSET_POINTS] = &points_gen_prime;
break;
case POINTS_NONPRIME:
generators[OFFSET_POINTS] = &points_gen_nonprime;
break;
case POINTS_ALL:
generators[OFFSET_POINTS] = &points_gen_allgroups;
break;
case POINTS_NONE:
generators[OFFSET_POINTS] = &gen_skip;
break;
}
}
static void exhaustive_ainit(arg_t **argss, const config_t *cfg) {
if (cfg->anomalous) {
arg_t *field_arg = arg_new();
arg_t *eq_arg = arg_new();
size_t *i = try_calloc(sizeof(size_t));
*i = 3;
field_arg->args = i;
field_arg->nargs = 1;
eq_arg->args = i;
eq_arg->nargs = 1;
eq_arg->allocd = i;
argss[OFFSET_FIELD] = field_arg;
argss[OFFSET_B] = eq_arg;
}
if (cfg->points.type == POINTS_RANDOM) {
arg_t *points_arg = arg_new();
points_arg->args = &cfg->points.amount;
points_arg->nargs = 1;
argss[OFFSET_POINTS] = points_arg;
}
if (cfg->cofactor) {
arg_t *order_arg = arg_new();
arg_t *gens_arg = arg_new();
order_arg->args = &cfg->cofactor_bound;
order_arg->nargs = 1;
gens_arg->args = &cfg->cofactor_bound;
gens_arg->nargs = 1;
argss[OFFSET_ORDER] = order_arg;
argss[OFFSET_GENERATORS] = gens_arg;
}
}
void exhaustive_uinit(unroll_t *unrolls, const config_t *cfg) {
if (cfg->ansi) {
unrolls[OFFSET_SEED] = &ansi_unroll_seed;
} else {
unrolls[OFFSET_SEED] = &unroll_skip;
}
unrolls[OFFSET_FIELD] = &unroll_skip;
unrolls[OFFSET_A] = &unroll_skip;
unrolls[OFFSET_B] = &unroll_skip;
unrolls[OFFSET_CURVE] = &curve_unroll;
unrolls[OFFSET_ORDER] = &unroll_skip;
unrolls[OFFSET_GENERATORS] = &gens_unroll;
unrolls[OFFSET_POINTS] = &points_unroll;
}
int exhaustive_gen_retry(curve_t *curve, const config_t *cfg,
gen_t generators[], arg_t *argss[], unroll_t unrolls[],
offset_e start_offset, offset_e end_offset,
int retry) {
if (start_offset == end_offset) {
return 2;
}
if (start_offset > end_offset) {
return 0;
}
pari_sp stack_tops[OFFSET_END] = {0};
int gen_tries[OFFSET_END] = {0};
int state = start_offset;
while (state < end_offset) {
stack_tops[state] = avma;
int diff = generators[state](curve, cfg, argss ? argss[state] : NULL);
int new_state = state + diff;
if (new_state < start_offset) new_state = start_offset;
if (diff <= 0) {
if (diff == INT_MIN || state + diff < 0) {
fprintf(err, "Error generating a curve. state = %i\n", state);
return 0;
}
// record try
int tried = ++gen_tries[state];
if (retry && tried >= retry) {
if (cfg->verbose) {
fprintf(verbose, "Reached retry limit: %i, state = %i\n",
retry, state);
}
return 0;
}
// unroll
for (int i = state; i > new_state;) {
if (unrolls && unrolls[i]) {
i += unrolls[i](curve, cfg, stack_tops[i],
stack_tops[i - 1]);
} else {
--i;
}
}
if (cfg->verbose) {
if (diff < 0) {
fprintf(verbose, "-");
} else {
fprintf(verbose, ".");
}
}
// unroll stack
avma = stack_tops[new_state];
} else {
// we are going forward, reset tries
gen_tries[state] = 0;
if (cfg->verbose) fprintf(verbose, "+");
}
state = new_state;
}
if (cfg->verbose) fprintf(verbose, "\n");
return 1;
}
int exhaustive_gen(curve_t *curve, const config_t *cfg, gen_t generators[],
arg_t *argss[], unroll_t unrolls[], offset_e start_offset,
offset_e end_offset) {
return exhaustive_gen_retry(curve, cfg, generators, argss, unrolls,
start_offset, end_offset, 0);
}
static void exhaustive_init() { anomalous_init(); }
static void exhaustive_quit(arg_t *argss[]) {
equation_quit();
anomalous_quit();
for (size_t i = 0; i < OFFSET_END; ++i) {
if (argss[i]) {
arg_free(&(argss[i]));
}
}
}
int exhaustive_do(config_t *cfg) {
debug_log_start("Starting Exhaustive method");
gen_t generators[OFFSET_END] = {NULL};
arg_t *argss[OFFSET_END] = {NULL};
unroll_t unrolls[OFFSET_END] = {NULL};
exhaustive_ginit(generators, cfg);
exhaustive_ainit(argss, cfg);
exhaustive_uinit(unrolls, cfg);
exhaustive_init();
output_o_begin(cfg);
for (unsigned long i = 0; i < cfg->count; ++i) {
debug_log_start("Generating new curve");
curve_t *curve = curve_new();
if (!exhaustive_gen(curve, cfg, generators, argss, unrolls, OFFSET_SEED,
OFFSET_END)) {
curve_free(&curve);
return EXIT_FAILURE;
}
debug_log_end("Generated new curve");
output_o(curve, cfg);
if (i != cfg->count - 1) {
output_o_separator(cfg);
}
curve_free(&curve);
}
output_o_end(cfg);
exhaustive_quit(argss);
debug_log_end("Finished Exhaustive method");
return EXIT_SUCCESS;
}
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